EASY
11th ICSE
IMPORTANT
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A block just begins to slide over a horizontal floor, when pulled by a force of 10 N. If we pull it by a force of  6 N, the force of friction that will come in to play is :

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Important Questions on Friction

EASY
11th ICSE
IMPORTANT
A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is:
EASY
11th ICSE
IMPORTANT

A cubical block of mass m is held stationary against a rough wall by applying a horizontal force F, as shown. Which of the following statements is incorrect?

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MEDIUM
11th ICSE
IMPORTANT
A rope lies on a table with a part hanging over the table’s edge. The rope starts sliding when the length of the hanging part is 20% of the total length. The coefficient of friction between the rope and the table is:
MEDIUM
11th ICSE
IMPORTANT

In the figure, a ladder of mass m  is shown leaning against a wall. It is in static equilibrium making an angle θ with the horizontal floor. The coefficient of friction between the wall and the ladder is μ1 and that between the floor and the ladder is μ2. The normal reaction of the wall on the ladder is N1 and that of the floor is N2. If the ladder is about to slip, then:

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HARD
11th ICSE
IMPORTANT
A box has to be dragged on a rough level with constant velocity by applying force F  making an angle α with horizontal. The angle of friction is θ, in order that the required force be minimum, we should have:
 
MEDIUM
11th ICSE
IMPORTANT
An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemispherical surface to the insect makes an angle α with the vertical, then the maximum possible value of α is given by :
MEDIUM
11th ICSE
IMPORTANT
A block of mass  m is placed on a surface with a vertical cross-section given by y=x36. If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is:
EASY
11th ICSE
IMPORTANT
When a bicycle is in motion, the force of friction exerted by the ground on the two wheels acts: